Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

What always comes into a house through the keyhole?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Three friends decide to distribute the soda cans they had among them. When all of them had drunk four cans each, the total number of cans that remained was equal to the cans each one of them had after they had divided the cans.

Can you calculate the total number of cans before distribution?

This is a famous paradox which has caused a great deal of argument and disbelief from many who cannot accept the correct answer. Four balls are placed in a hat. One is white, one is blue and the other two are red. The bag is shaken and someone draws two balls from the hat. He looks at the two balls and announces that at least one of them is red. What are the chances that the other ball he has drawn out is also red?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.